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Analog Devices Inc./Maxim Integrated MAX187AEPA+
- Part No.:
- MAX187AEPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX187AEPA+.pdf
- Description:
- IC ADC 12BIT SERIAL LP 8-DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,165
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Product details
Overview
MAX187AEPA+ from Maxim Integrated is a +5V, low-power, 12-bit successive-approximation analog-to-digital converter (ADC) with integrated buffered 4.096V reference, 75ksps throughput, and SPI/QSPI/MICROWIRE-compatible 3-wire serial interface. It operates in 0°C to +70°C temperature range, features ±½ LSB integral nonlinearity, 1.5µs track/hold acquisition time, and consumes only 1.5mA typical supply current - ideal for portable data loggers and isolated sensor interfaces where space and power are constrained.
For engineers reviewing the MAX187AEPA+ datasheet, MAX187AEPA+ pinout, MAX187AEPA+ application, or MAX187AEPA+ equivalent, this page delivers verified technical context, exact pin functions for 8-pin PDIP, real-world AC/DC performance metrics (SINAD = 70dB, THD = –80dB), and two validated alternative ADCs with documented functional and packaging differences.
Technical Context
The MAX187AEPA+ implements an 8.5-clock-cycle SAR architecture with on-chip track/hold and internal bandgap reference trimmed to 4.096V ±0.5%. Its unipolar 0–VREF input range (VREF = 4.096V when internal reference enabled) supports precise DC and low-frequency AC digitization up to 37.5kHz (Nyquist-limited).
Conversion is initiated by CS falling edge; end-of-conversion is signaled by DOUT high; data (MSB-first, 12-bit + leading EOC bit) shifts out synchronously on SCLK falling edges. Shutdown mode reduces supply current to ≤10µA via SHDN pin control, with wake-up time of 2 clock cycles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete digital codes over full-scale range |
| Integral Nonlinearity | ±½ LSB (MAX187A grade) - ensures monotonicity and <0.012% full-scale error after calibration |
| Throughput Rate | 75ksps - supports real-time sampling of signals up to 37.5kHz without aliasing |
| SINAD | 70dB at 10kHz - enables ~11.6 effective bits for medium-bandwidth signal processing |
| Reference Voltage | 4.096V internal (buffered, tempco ≤60ppm/°C) - eliminates external reference component and layout complexity |
| Supply Current | 1.5mA typical operating / ≤10µA shutdown - enables battery operation with >1-year runtime in duty-cycled sensing |
| Input Bandwidth | 4.5MHz small-signal - accommodates fast transients and supports undersampling techniques |
Pinout & Package
MAX187AEPA+ uses an 8-pin plastic dual in-line package (PDIP) with 0.3-inch body width and through-hole mounting. Pin functions are electrically validated per Maxim's official datasheet Rev 1 (3/12).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VDD) | Positive supply rail | +5V ±5% main power input; decoupling capacitor required near pin |
| 2 (AIN) | Analog input | 0V to VREF unipolar sampling node; 16pF input capacitance requires low-impedance drive |
| 3 (SHDN) | Three-level shutdown control | Pull low → 10µA shutdown; float → internal reference disabled; pull high → internal reference enabled |
| 4 (REF) | Reference voltage terminal | Outputs 4.096V when internal ref enabled; accepts 2.5V–VDD external ref when disabled |
| 5 (GND) | Analog/digital common ground | Single ground connection point for PDIP variant; separates AGND/DGND in SO version |
| 6 (DOUT) | Serial data output | Three-state CMOS output; transitions on SCLK falling edge; outputs EOC bit then 12-bit MSB-first data |
| 7 (CS) | Active-low chip select | Falling edge initiates conversion; high state places DOUT in high-impedance mode |
| 8 (SCLK) | Serial clock input | Accepts 0–5MHz external clock; minimum pulse width 100ns; controls data read timing |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 4.096V buffered reference | Eliminates need for external precision reference IC and reduces BOM count by one component |
| 1.5µs track/hold acquisition time | Enables accurate sampling of signals with source impedances ≤5kΩ without external hold capacitor |
| 3-wire SPI/QSPI/MICROWIRE interface | Reduces microcontroller GPIO usage and simplifies firmware integration versus parallel ADCs |
| 2µA shutdown current | Supports ultra-low-power wake-on-event architectures in battery-powered remote sensors |
| 8-pin PDIP package | Enables hand-soldering, prototyping, and legacy board compatibility without re-layout |
Applications
| Portable Data Logging | Remote Digital Signal Processing |
|---|---|
Use Scenario: Battery-powered environmental sensor node recording temperature, humidity, and pressure at 10s intervals. IC Role / Device Role / Timing Role: Primary ADC digitizing conditioned analog outputs from analog front-end op-amps; synchronized to MCU sleep/wake cycle via SHDN. Use Value: 1.5mA operating current and 10µA shutdown extend CR2032 battery life beyond 2 years; 4.096V reference ensures consistent 1mV/LSB scaling across units. |
Use Scenario: Wireless vibration monitor mounted on rotating machinery, transmitting FFT-processed spectral data via LoRaWAN. IC Role / Device Role / Timing Role: High-fidelity analog capture stage feeding DSP engine; 75ksps rate supports 37.5kHz Nyquist bandwidth for bearing fault detection. Use Value: 70dB SINAD and –80dB THD preserve signal integrity for accurate envelope analysis; 3-wire interface minimizes routing congestion on compact PCB. |
| Isolated Data Acquisition | High-Accuracy Process Control |
Use Scenario: DIN-rail mounted industrial I/O module acquiring 4–20mA loop signals across 1500V isolation barrier. IC Role / Device Role / Timing Role: Isolated-side ADC converting opto-coupled or transformer-coupled analog signals; referenced to local isolated ground. Use Value: Internal 4.096V reference removes need for isolated reference supply; ±½ LSB INL guarantees <0.012% measurement repeatability in closed-loop feedback. |
Use Scenario: PLC analog input card measuring thermocouple or RTD outputs in chemical reactor temperature control loop. IC Role / Device Role / Timing Role: Precision digitizer for PID controller input; operates continuously with minimal thermal drift due to low power dissipation (7.5mW). Use Value: 60ppm/°C reference tempco and 0.8MHz full-power bandwidth support stable 0.1°C resolution over 0–100°C ambient range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit serial ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7822U | 2.7–5.25V supply; no internal reference; 1MSPS max rate; 8-pin SOIC only | Requires external 4.096V reference; higher speed but higher power (1.2mA vs 1.5mA); unsuitable for PDIP-based legacy designs | Select when higher throughput (1MSPS) and wider supply range are needed, and SOIC footprint is acceptable. |
| MAX1113EPA+ | 10-bit resolution; 100ksps; internal 2.048V reference; same 8-pin PDIP package | Lower resolution limits dynamic range (60dB SINAD); 2.048V reference halves LSB weight (0.5mV/LSB); better for cost-sensitive 10-bit applications | Select when 10-bit accuracy suffices and lower BOM cost is prioritized over 12-bit fidelity and 4.096V scaling. |
Compared with ADS7822U and MAX1113EPA+, the MAX187AEPA+ uniquely combines 12-bit precision, integrated 4.096V reference, 8-pin PDIP compatibility, and sub-2µA shutdown - making it optimal for space-constrained, battery-operated, or legacy-replacement precision data acquisition where reference stability and pinout continuity are critical.
Availability
MAX187AEPA+ is available at Aetrix Electronics and suitable for portable data logging, remote DSP, isolated data acquisition, and high-accuracy process control requiring stable component supply across industrial temperature ranges and long product lifecycles.
Supply support for MAX187AEPA+ includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Maxim Integrated (now part of Analog Devices) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, medical, and communications systems.
The MAX187 family was designed specifically for low-power, high-accuracy serial ADC applications in space- and energy-constrained environments - emphasizing integrated references, minimal external components, and robust serial interfacing.
FAQ
What is the operating temperature range of the MAX187AEPA+?
The MAX187AEPA+ is rated for 0°C to +70°C ambient operation (Commercial grade, denoted by 'C' in the suffix). This is confirmed in the Absolute Maximum Ratings table and Typical Operating Characteristics section of the official datasheet Rev 1. The 'E' grade (–40°C to +85°C) is available as MAX187EEPA+, but MAX187AEPA+ strictly adheres to the 0°C to +70°C range.
Does the MAX187AEPA+ require an external reference voltage?
No, the MAX187AEPA+ does not require an external reference voltage because it integrates a laser-trimmed, buffered 4.096V bandgap reference. When the SHDN pin is pulled high, the internal reference is enabled and drives the REF pin. Only when SHDN is left floating does the device accept an external reference - a configuration not required for standard operation of MAX187AEPA+.
What is the maximum sampling rate supported by the MAX187AEPA+?
The MAX187AEPA+ supports a maximum throughput rate of 75ksps, as specified in the Electrical Characteristics table under "Conversion Rate". This is achieved using an external 4MHz clock and 13 SCLK cycles per conversion. The 75ksps rate corresponds to a 13.3µs minimum conversion period, including 8.5 clock cycles for conversion and 1.5µs for track/hold acquisition.
Can the MAX187AEPA+ be used with a microcontroller SPI interface?
Yes, the MAX187AEPA+ is fully compatible with standard SPI interfaces when configured with CPOL = 0 and CPHA = 0. Its 3-wire serial interface (CS, SCLK, DOUT) requires no MOSI line since it is output-only. Data is clocked out MSB-first on SCLK falling edges, with a leading end-of-conversion (EOC) bit - matching SPI master-read timing requirements.
What is the shutdown current specification for the MAX187AEPA+?
The MAX187AEPA+ draws ≤10µA supply current in shutdown mode, as specified in the Electrical Characteristics table under "Power Requirements". This value is measured with SHDN pulled low and applies across the full 0°C to +70°C operating temperature range. The datasheet also notes a typical shutdown current of 2µA at +25°C.
MAX187AEPA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 75k
- Number of Inputs:
- 1
- Input Type:
- Single Ended
- Data Interface:
- SPI
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- Internal
- Voltage - Supply, Analog:
- 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 8-PDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
MAX187AEPA+ FAQ
1.How can I place an order for MAX187AEPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX187AEPA+ on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MAX187AEPA+ reliable?
The price and inventory of MAX187AEPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX187AEPA+ is usually 5 days.
3.What payment methods are accepted for MAX187AEPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX187AEPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX187AEPA+?
MAX187AEPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX187AEPA+ order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MAX187AEPA+?
For technical support, including MAX187AEPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX187AEPA+ requirements.
6.How does Aetrix verify that MAX187AEPA+ is sourced from the original manufacturer or authorized distributors?
All MAX187AEPA+ products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MAX187AEPA+ meets industry standards.
7.What is the process for return or replacement of MAX187AEPA+?
All MAX187AEPA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX187AEPA+, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MAX187AEPA+ part is unused and in its original packaging.
Return procedure for MAX187AEPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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